Spotters New Nightforce spotter.

BurtG

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  • Nov 9, 2022
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    Is there a thread ? I can’t find it


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    Resurrecting this thread with a legitimate question.

    Since the zero of the reticle (and for that matter, the top of the 5 mil vertical axis in the reticle) is below the centerline of the scope, how in the hell do people set up a LRF on the cage? If I coalign the LRF at 1000 yds to be on the zero of the reticle, it’ll be many mils high at 100 yds and decreasing until the distance reaches the range at which the LRF is coaligned with the reticle (1000 yds in this case). That’s not super useful in a field environment, especially in daylight when you can’t see the red aiming laser on the LRF.

    In my case I’m talking specifically about the mil xts reticle but from I can see the Tremor4 will have the same issue.
     
    Resurrecting this thread with a legitimate question.

    Since the zero of the reticle (and for that matter, the top of the 5 mil vertical axis in the reticle) is below the centerline of the scope, how in the hell do people set up a LRF on the cage? If I coalign the LRF at 1000 yds to be on the zero of the reticle, it’ll be many mils high at 100 yds and decreasing until the distance reaches the range at which the LRF is coaligned with the reticle (1000 yds in this case). That’s not super useful in a field environment, especially in daylight when you can’t see the red aiming laser on the LRF.

    In my case I’m talking specifically about the mil xts reticle but from I can see the Tremor4 will have the same issue.

    What you're describing is the reverse of what would happen if you zeroed the laser on the center of the image and then used the reticle to aim it. If you zero on the reticle at 1000 yds, at 100 yds your laser will be 90% of your coaxial offset high if laser mounted above scope.

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    ^ I think if you zero your RF to the reticle , the reticles position doesn’t matter

    It definitely matters if the reticle is not centered in the scope, which is the case with the nightforce cfs. If the lrf is 3.5” above the center of the scope, and the reticle is below center, there will always be a crossing angle and only one range where the lrf beam is coaligned with the zero in the reticle of the scope.

    Ultimately, Nightforce had some technical guidance on the topic. Their solution is to use a 100yd grid target and align the lrf aiming point 3.5” above the 5 mil vertical zero in the mil-xts reticle (this is pretty close to the center of the scope field). That was with a vortex impact 4000, but I used the same for Mars-Lc and it’s workable. When ranging I just use the 5 mil aiming dot for ranging, I can only go out to 800 here at the house and it works fine.
     
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    What you're describing is the reverse of what would happen if you zeroed the laser on the center of the image and then used the reticle to aim it. If you zero on the reticle at 1000 yds, at 100 yds your laser will be 90% of your coaxial offset high if laser mounted above scope.

    View attachment 8481732

    It’s not the reverse, we’re saying the exact same thing as best I can tell from your illustration.
     
    It definitely matters if the reticle is not centered in the scope, which is the case with the nightforce cfs. If the lrf is 3.5” above the center of the scope, and the reticle is below center, there will always be a crossing angle and only one range where the lrf beam is coaligned with the zero in the reticle of the scope.

    Ultimately, Nightforce had some technical guidance on the topic. Their solution is to use a 100yd grid target and align the lrf aiming point 3.5” above the 5 mil vertical zero in the mil-xts reticle (this is pretty close to the center of the scope field). That was with a vortex impact 4000, but I used the same for Mars-Lc and it’s workable. When ranging I just use the 5 mil aiming dot for ranging, I can only go out to 800 here at the house and it works fine.

    It's only "many mils high" inside of 50 yards, because it's a consistent linear rate of increase from 0" at 1000 yds to whatever the offset height is at 0 yds.

    If the offset height is 4", the laser impact offset will be:

    1000: 0", 0 mils
    900: 0.4", .012 mils
    800: 0.8", .028 mils
    700: 1.2", .048 mils
    600: 1.6", .074 mils
    500: 2.0", .111 mils
    400: 2.4", .167 mils
    300: 2.8", .259 mils
    200: 3.2", .444 mils
    100: 3.6", 1 mil
    50: 3.8", 2.111 mils
    25: 3.9", 4.33 mils
    10: 3.96, 11 mils.

    Yes, there's an offset, but it's negligible over the distances the scope/laser is used for.

    Hope that and the image above helps.
     
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    How are people liking these so far? Glorified scope or does it compare to the swaro and hensdoldt? Why not just buy a 7-35 atacr with bigger objective and spot with that?
    I have a Hensoldt spotter 60, and this nightforce.

    I never use the Hensoldt. Friends have borrowed it to RO more than I’ve ever used it. Time will tell if I use the nightforce. I feel like the nightforce is easier to transport and I definitely believe the nightforce is easier to use if you’re transitioning between multiple targets, probably because it’s 30% or so less weight, even more if you have the badger slick like mine..

    The nightforce has massive field of view, more than the atacr, has more fluid (less tension) focus and magnification adjustments, costs less and has an Arca rail and mlok accessory rails built into the package. The reticle being lower in the view also gives more visibility. It’s just not even a real comparison to say “use an atacr.” I think you’d agree if you compared them side by side.
     
    I've used an ATACR 7-35 and a CFS side by side and I love the CFS. The field of view is huge. I'm not an engineer so I can't explain why it works, but the offset of an LRF on a CFS is a non-issue.
     
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    field of view on this would be large for a riflescope, but it's tiny for a spotting scope. Most wide-angle spotters will have a FOV of around 120+ ft @ ~25 x, or 100 ft at 30 x. Not 7.
     
    field of view on this would be large for a riflescope, but it's tiny for a spotting scope. Most wide-angle spotters will have a FOV of around 120+ ft @ ~25 x, or 100 ft at 30 x. Not 7.

    I think you have some numbers mixed up, probably comparing different distances and magnification. 100ft at 30x sounds like a 1000yd fov not a 100yd fov.
     
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